You can use CSS for this. Follow the tutorial to see how to do this in Mendix.
Then use the ':hover' example here to add a class to your button.
Thank you Lennart!
The thing with calypso works fine.
But where do I find a specific button in my “custom variables”?
The buttons can be styled using Sass classes. How to work with Sass to change styling, you might want to read up on in this lecture: https://academy.mendix.com/link/path/105/Style-your-App-with-CSS.
I found it. Sorry for these easy questions, I’am totally new.
One further question.
When I am customizing with CSS, will the app still be compatible with MindSphere?